JP3799094B2 - Desk and chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair such as a connected chair that is used in a theater, an auditorium, or other various halls, and in particular, is used as a table top by rotating the back plate to make it almost horizontal. The present invention relates to a desk / chair that can be used.
[0002]
[Prior art]
Conventionally, many chairs installed and used in theaters and the like are arranged at intervals suitable for theatrical appreciation and the like, but it is inconvenient for lectures and conferences because there is no place for expanding materials or taking notes.
[0003]
For this reason, as disclosed in, for example, Japanese Patent Publication No. 61-30564 and Japanese Patent Publication No. 7-87807, the back seat of the back seat of the back seat of the back seat can be placed on the back seat by tilting the backrest. Chairs that can be used as are being developed.
[0004]
[Problems to be solved by the invention]
In both the above-mentioned conventional examples, when the top plate used as a desk is in a horizontal state due to the structure of the link, it often takes time to raise the backrest from this state. When a seated person evacuates urgently due to a fire, etc.
[0005]
In order to solve this problem, Japanese Patent Application Laid-Open No. 5-29462 proposes that the top plate is slid back and forth in a horizontal state. However, simply by sliding back and forth, it can be used as a desk. Sometimes it is difficult to use because it moves forward, and things that move forward during emergency evacuation may return to the rear without being locked in that state. For this reason, if the locking device is attached to the front and rear slides, the occupant may take time to release the locking device, and evacuation may be delayed.
[0006]
In order to solve such problems, the present invention can be moved forward in a horizontal state where the top plate is used as a desk by a simple operation, and can be easily disturbed by an emergency evacuation person. The purpose is to provide a highly safe desk and chair that is not likely to become.
[0007]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) The lower end of the first link connecting rod is pivotally attached to the middle upper part in the front-rear direction of the left and right side plates provided on both sides of the seat, and the back side is the top of the desk on the upper end of the first link connecting rod. The upper part of the back plate to be a plate is pivotably pivoted, the upper end of the second link connecting rod is pivotally attached to the middle portion of the back plate, and the lower end of the second link connecting rod is Means for slidably and rotatably engaging with a vertical groove provided on the side surface of the rear portion of the frame body and releasably locking the lower end of the second link connecting rod to the upper part of the groove The back plate is pivoted upward from the original standing state as the back plate around the pivot point between the upper end of the first link connecting rod and the back plate and functions as a desk. It is possible to move to the state and rotate forward from the horizontal state around the pivoting portion at the lower end of the first and second link connecting rods And ability.
[0008]
(2) In the above item (1), the rear stop position of the first link connecting rod until the back plate is rotated from the standing state to the horizontal state, and the back plate is rotated forward from the horizontal state. Stoppers for preventing the rotation of the first link connecting rod are disposed at the front stop position of the first link connecting rod.
[0009]
(3) In the above item (1) or (2), the first link connecting rod and the second connecting rod are parallel links.
[0010]
(4) In any one of the above items (1) to (3), the lower end portion is pivotally mounted near the lower end portion of the second link connecting rod, and the upper end portion is pivotally mounted on the back plate. Elastic means that act to reduce the load are provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view of an embodiment of a desk and chair according to the present invention, in which the seat is removed and the left side plate (1) is indicated by an imaginary line. Moreover, FIGS. 2-4 is a side view from the left side which shows the state which removed this left side plate, and has shown the rotation state of a part of backrest (2). 2 to 4, the mounting rotation mechanism of the seat portion (3) is omitted because it is outside the scope of the present invention.
[0012]
FIG. 2 shows a state where the desk / chair of the present invention is used as a chair.
The frame body (5) attached to the leg portion (4) is formed by fixing columns (5b) extending obliquely upward to the rear at both left and right ends of the channel member (5a) that opens downward. .
[0013]
The support column (5b) is provided with a groove (6) that extends long in the longitudinal direction, that is, in the up and down direction slightly inclined backward. In the groove (6), a second link connecting rod, that is, a slide shaft (8) pivotally attached to the lower end of the linear slide arm (7) is slidably and pivotably mounted.
[0014]
The upper end of the slide arm (7) is pivotally attached to the back plate mounting bracket (10) by a pin (9) above the post (5b). A back plate (11) is attached to the back plate mounting bracket (10). The back surface of the back plate (11) serves as a top plate of the desk as will be described later. An upper backrest mat (12a) that forms a part of the backrest is attached to the front surface of the backboard (11). The pivot position of the upper end of the slide arm (7) is an intermediate portion of the back plate (11), more specifically, a substantially central position.
[0015]
A first link connecting rod, that is, an upper end portion of the arm (13) is pivotally attached to the upper end of the back plate mounting bracket (10) by a pin (14). The arm (13) is a member bent in a substantially W shape, and its lower end is pivotally attached to a side plate (1) integrated with the frame body (5) by a pin (15). In FIG. 2, the left side plate (1) is omitted, but the pivoted state can be seen from the other side, that is, the right side plate (1).
The stopper (5c) provided on the front face of the top of the support (5b) and the stopper (16) provided on the side plate (1) limit the rotation range of the arm (13), which will be described later.
[0016]
Reference numeral (17) denotes a back plate mounting bracket (10) whose lower end is pivotally mounted near the pivot point of the lower end of the slide arm (7) and whose upper end is above the pivot point of the upper end of the slide arm (7). It is a gas spring that is pivotally attached to the main body and acts mainly as a compression spring. In some cases, the gas spring (17) may be replaced with an elastic means such as a coil spring.
Reference numeral (18) denotes a magnet catch that holds the back plate (11) in its upright position. Reference numeral (12b) denotes a middle backrest mat attached between the left and right arms (13), and reference numeral (12c) denotes a lower backrest mat attached between the left and right support columns.
[0017]
As shown in FIGS. 5 to 7 in an enlarged manner, in the vicinity of the upper end of the column (5b) of the frame main body (5), in front of the groove (6), slightly below the upper end of the groove (6), The locking piece (19) has its bent portion pivoted by the shaft (20).
The locking piece (19) is a substantially L-shaped member, the horizontal piece (19a) facing rearwardly protrudes across the groove (6), and the hanging piece (19b) facing downward is The front surface is in contact with a locking portion (5d) formed on the column (5b).
[0018]
An operation lever (21) for releasing the lock is integrally formed at the intermediate portion (or one outer end) of the shaft (20) that rotates integrally with the left and right locking pieces (19) and (19). Is provided.
[0019]
The desk / chair of the present invention has the above-described configuration, and is always in use as a chair as shown in FIG. In this state, the back plate (11) is rotated and biased by its own weight around the pin (14), and is further pushed slightly diagonally until it abuts against the rear surface of the column (5b) of the frame body (5). This position is held by the magnet catch (18) attached near the lower end of the back plate (11). The rear part of the arm (13) contacts the stopper (5c) on the front surface of the support column (5b), and the slide shaft (8) at the lower end of the slide arm (7) is near the lower end of the groove part (6) of the support column (5b). Has reached.
[0020]
To change from using this chair as a desk for a seated person in the back seat, push the upper part of the back plate (11) forward or pull the lower end backward to (11) That is, a part of the backrest (2) is largely rotated counterclockwise in the drawing around the pin (14) at the upper end of the arm (13) to obtain the state shown in FIG.
At this time, the slide shaft (8) at the lower end of the slide arm (7) moves upward in the groove (6) as the sladd arm (7) moves.
[0021]
As shown in FIG. 5, when the slide shaft (8) approaches the upper end of the groove (6), as shown in FIG. 6, the horizontal piece (19a) of the locking piece (19) is thrown up and passed through. As shown in FIG. 4, the upper end of the groove (6) is reached and then slightly returned, and is brought into contact with and locked to the upper surface of the horizontal piece (19a).
In this state, the load is received by the front surface of the hanging piece (19b) coming into contact with the locking portion (5d) of the support column (5b). At this time, the back surface of the back plate (11) becomes the top plate of the desk, and the seated person in the back seat can use this desk without getting out of the body.
[0022]
To return from this state to the state shown in FIG. 1, the release lever (2) provided integrally with the shaft (20) of the locking piece (19) is operated while lifting the rear part of the back plate (11). The horizontal piece (19a) of the locking piece (19) may be raised once and passed through the slide shaft (8).
[0023]
In the state of FIG. 3, since it is an obstacle to the passage of people, when the top plate of the desk, that is, the back plate (11) is pushed forward, it can be easily moved to the position shown in FIG. 4 by one operation. That is, the first and second link connecting rods that are pivotally attached to the back plate mounting bracket (10) with the upper end spaced apart and the lower end pivotally attached to the upper end of the groove (6) of the column (5b) and the side plate (1), That is, the back plate (11) moves forward while maintaining a substantially horizontal state by a parallel link mechanism including the arm (13) and the slide arm (7).
At this time, the gas spring (17) may act as a compression spring at all times to assist this movement and reduce the load on the back plate (11). Inverted, it should act as a tension spring when the back plate (11) moves forward from its midpoint, so that it does not become a resistance when the back plate (11) is pulled backwards, contrary to the above. .
In the state shown in FIG. 4, the stopper (16) contacts the front surface of the arm (13), and the back plate (11) is stably stopped at the position where it has moved forward.
[0024]
If the back plate (11) is pulled backward, the state shown in FIG. 3 is restored.
[0025]
In the present invention, when it is not necessary to move the back plate (11) from the position shown in FIG. 3 to the front position as shown in FIG. ) May be directly pivoted to the frame body (5) without going through.
[0026]
【The invention's effect】
According to the present invention, when the back plate is used as the top plate of the desk, the pivot point between the upper end of the first link connecting rod and the upper portion of the back plate stopped at the rear is the rotation center, When the back plate is rotated from the standing state to the horizontal state, the lower end of the second link connecting rod moves from the lower part to the upper part of the groove of the frame body, and the upper part of the groove part is prevented from moving downward. By being locked, the back plate is maintained in a horizontal state.
Moreover, when the back plate is pushed forward and upward from this horizontal state, the back plate immediately reaches the unused position for emergency evacuation ahead while maintaining the almost horizontal state around the pivot point at the lower end of both link connecting rods. Moved.
In this way, since the back plate can be moved forward in a horizontal state using the back plate as a desk with a simple operation, the seated person can be prevented in the event of an earthquake or fire in the building. In the case of emergency evacuation, the back plate is safe and does not interfere with the emergency evacuation person (invention of claim 1).
[0027]
When returning the back plate from the non-use position for emergency evacuation to the use position as the top plate of the rear desk, it is only necessary to pull the back plate backward and upward by the reverse operation of the front. The plate is substantially translated backward about the pivot point at the lower end of both link connecting rods, and returned to the original horizontal state.
In order to return the back plate to the upright state, the locked state between the lower end of the second link connecting rod and the upper portion of the groove portion may be released, whereby the lower end of the second link connecting rod lowers the groove portion downward. The back plate can be returned to the standing state (invention of claim 1).
[0028]
As in the second aspect of the invention, the rear stop position of the first link connecting rod until the back plate turns from the standing state to the horizontal state, and the back plate rotates forward from the horizontal state. If a stopper for preventing the rotation of the first link connecting rod is provided at the front stop position of the one link connecting rod, the back-and-forth movement of the back plate in the horizontal state can be reliably stopped.
[0029]
When the first link connecting rod and the second connecting rod are parallel links as in the invention described in claim 3, the back plate can be moved back and forth in a horizontal state.
[0030]
As in the invention described in claim 4, the lower end portion is pivotally mounted in the vicinity of the lower end portion of the second link connecting rod, and the upper end portion is pivotally mounted on the back plate so as to reduce the load on the back plate. If the elastic means to perform is provided, the back plate can be moved back and forth with a light force, and operability and safety are improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a desk and chair according to the present invention, with a seat portion and a left side plate removed in a use state as a chair.
FIG. 2 is a side view showing the embodiment of FIG. 1 with the left side plate removed.
3 is a side view showing the embodiment of FIG. 1 in use as a desk with the left side plate removed. FIG.
4 is a view similar to FIG. 3 showing a state in which the top plate is moved forward. FIG.
FIG. 5 is an enlarged side view showing a locking piece attached in the vicinity of the upper end of the support of the frame body and a slide shaft that moves upward in the groove of the support.
6 is a view similar to FIG. 5 showing a state in which the slide shaft is passing through the locking piece. FIG.
7 is a view similar to FIG. 5 showing a state after the slide shaft has passed through the locking piece.
[Explanation of symbols]
(1) Side plate
(2) Backrest
(3) Seat
(4) Leg
(5) Frame body
(5a) Channel member
(5b) Prop
(5c) Stopper
(5d) Locking part
(6) Groove
(7) Slide arm (second link connecting rod)
(8) Slide shaft
(9) Pin
(10) Back plate mounting bracket
(11) Back plate
(12a) Upper back mat
(12b) Middle backrest mat
(12c) Lower back mat
(13) Arm (first link connecting rod)
(14) Pin
(15) Pin
(16) Stopper
(17) Gas spring
(18) Magnet catch
(19) Locking piece
(19a) Horizontal piece
(19b) Hanging piece
(20) axis
(21) Release lever

Claims (4)

The lower end of the first link connecting rod is pivotally attached to the middle upper portion in the front-rear direction of the left and right side plates provided on both sides of the seat, and the back side is the top plate of the desk at the upper end of the first link connecting rod. The upper part of the back plate is pivotally attached so that it can be turned upside down, the upper end of the second link connecting rod is pivotally attached to the middle portion of the back plate, and the lower end of the second link connecting rod is attached to the frame body. A means for slidably and rotatably engaging with a vertical groove provided on the side surface of the rear part, and a means for releasably locking the lower end of the second link connecting rod at the upper part of the groove, The back plate is moved from the original standing state as the back plate to a substantially horizontal state that functions as a desk by rotating upward around the pivot point between the upper end of the first link connecting rod and the back plate. It is possible to rotate forward from the horizontal state around the pivotally attached portion at the lower end of the first and second link connecting rods. Desk also serves as chair, characterized in that it was.   A rear stop position of the first link connecting rod until the back plate rotates from the standing state to a horizontal state, and a front stop position of the first link connecting rod where the back plate rotates forward from the horizontal state. The desk / chair according to claim 1, further comprising a stopper for preventing rotation of the first link connecting rod.   The desk / chair according to claim 1 or 2, wherein the first link connecting rod and the second connecting rod are parallel links.   A lower end portion is pivotally attached near the lower end portion of the second link connecting rod, and an upper end portion is pivotally attached to the back plate, and comprises elastic means that acts to reduce the load on the back plate. The desk / chair according to any one of claims 1 to 3.

Images